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How to Specify New Gcc Path For Cmake?

2 minutes read

To specify a new GCC path for CMake, you can use the CMAKE_C_COMPILER and CMAKE_CXX_COMPILER variables in your CMakeLists.txt file. These variables allow you to explicitly define the path to the GCC compiler you want to use for compiling your project.


For example, if you have a GCC compiler installed on a specific path (e.g. /usr/bin/gcc-8) and you want CMake to use this compiler for your project, you can set the CMAKE_C_COMPILER and CMAKE_CXX_COMPILER variables to point to this path:

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set(CMAKE_C_COMPILER "/usr/bin/gcc-8")
set(CMAKE_CXX_COMPILER "/usr/bin/g++-8")


By setting these variables, CMake will use the specified GCC compiler for compiling your project instead of the default compiler. This can be helpful when you have multiple versions of GCC installed on your system and you want to ensure that a specific version is used for your project.


How to override the gcc path in cmake using environment variables?

To override the gcc path in CMake using environment variables, you would need to set the CC and CXX variables to point to the desired gcc compiler executable in your environment.


Here's how you can do it:

  1. Set the CC and CXX environment variables to the path of the desired gcc compiler executable. You can do this in your terminal before running CMake: export CC=/path/to/gcc export CXX=/path/to/g++
  2. Then, when running CMake, make sure to use the -DCMAKE_C_COMPILER and -DCMAKE_CXX_COMPILER flags to force CMake to use the environment variables you set: cmake -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX /path/to/your/source


By setting the CC and CXX environment variables and passing them to CMake using the -DCMAKE_C_COMPILER and -DCMAKE_CXX_COMPILER flags, you can override the gcc path used by CMake to compile your project.


What is the syntax for specifying a new gcc path in cmake?

To specify a new GCC path in CMake, you can use the following syntax:

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SET(CMAKE_C_COMPILER /path/to/your/gcc)
SET(CMAKE_CXX_COMPILER /path/to/your/g++)


Alternatively, you can specify the GCC paths when invoking CMake from the command line by adding the following flags:

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-DCMAKE_C_COMPILER=/path/to/your/gcc -DCMAKE_CXX_COMPILER=/path/to/your/g++


Make sure to replace /path/to/your/gcc and /path/to/your/g++ with the actual paths to your GCC and G++ compilers.


What is the recommended way to specify a gcc path in cmake?

You can specify the gcc path in CMake by setting the CMAKE_CXX_COMPILER variable to the path of the gcc compiler.


For example, if your gcc compiler is located at /usr/bin/gcc, you can specify the gcc path in CMake as follows:

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cmake -DCMAKE_CXX_COMPILER=/usr/bin/gcc path_to_source_code


Alternatively, you can also set the CC environment variable to the gcc compiler path before running CMake:

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export CC=/usr/bin/gcc
cmake path_to_source_code


Both of these methods will tell CMake to use the specified gcc compiler when building your project.

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